US 11,811,087 B2
Composition for non-aqueous secondary battery adhesive layer, battery member for non-aqueous secondary battery and method of producing same, method of producing laminate for non-aqueous secondary battery, and method of producing non-aqueous secondary battery
Hiroshi Koga, Tokyo (JP); Masanobu Sato, Tokyo (JP); and Koji Annaka, Tokyo (JP)
Assigned to ZEON CORPORATION, Tokyo (JP)
Appl. No. 17/266,107
Filed by ZEON CORPORATION, Tokyo (JP)
PCT Filed Aug. 22, 2019, PCT No. PCT/JP2019/032901
§ 371(c)(1), (2) Date Feb. 5, 2021,
PCT Pub. No. WO2020/045246, PCT Pub. Date Mar. 5, 2020.
Claims priority of application No. 2018-160806 (JP), filed on Aug. 29, 2018.
Prior Publication US 2021/0296732 A1, Sep. 23, 2021
Int. Cl. H01M 50/443 (2021.01); H01M 50/414 (2021.01); H01M 50/403 (2021.01); H01M 50/46 (2021.01); H01M 4/13 (2010.01); H01M 4/139 (2010.01); H01M 50/449 (2021.01); C09J 151/00 (2006.01); H01M 4/04 (2006.01)
CPC H01M 50/443 (2021.01) [C09J 151/003 (2013.01); H01M 4/0419 (2013.01); H01M 4/0471 (2013.01); H01M 4/13 (2013.01); H01M 4/139 (2013.01); H01M 50/403 (2021.01); H01M 50/414 (2021.01); H01M 50/461 (2021.01); H01M 50/449 (2021.01)] 8 Claims
 
1. A battery member for a non-aqueous secondary battery comprising:
a porous membrane layer-equipped substrate having a porous membrane layer formed on at least one surface of a substrate; and
an adhesive layer formed in plurality in a dotted form on the porous membrane layer, wherein
the substrate is a separator substrate or an electrode substrate,
the adhesive layer is a dried product of a composition for a non-aqueous secondary battery adhesive layer, and
the composition for the non-aqueous secondary battery adhesive layer comprises organic particles, a thixotropic agent, and water, wherein
the organic particles have a core-shell structure including a core portion and a shell portion at least partially covering an outer surface of the core portion,
the composition for the non-aqueous secondary battery adhesive layer has a viscosity η0 at a shear rate of 100 s−1 of less than 10 m·Pas, a viscosity η1 at a shear rate of 10,000 s−1 of not less than 0.5 m·Pas and not more than 2.4 m·Pas, and a ratio η0/η1 of the viscosity η0 relative to the viscosity η1 of not less than 1.2 and not more than 10,
the core portion is formed of a polymer having a degree of swelling in electrolyte solution of not less than a factor of 5 and not more than a factor of 30,
the polymer forming the core portion has a glass-transition temperature of not lower than −50° C. and not higher than 150° C.,
a core-shell ratio of the organic particles, which is an average thickness of the shell portion relative to a volume-average particle diameter (D50) of the organic particles, is 1.5% or more and 40% or less, and
the viscosity η0 and the viscosity Ili are each at a temperature of 25° C.
 
6. A method of producing a laminate for a non-aqueous secondary battery comprising:
an application step of, with respect to a porous membrane layer-equipped substrate having a porous membrane layer formed on at least one surface of a substrate, applying a composition for a non-aqueous secondary battery adhesive layer onto the porous membrane layer of the porous membrane layer-equipped substrate by an inkjet method;
a drying step of drying the composition for the non-aqueous secondary battery adhesive layer that has been applied onto the porous membrane layer to form an adhesive layer; and
an adhering step of adhering the porous membrane layer-equipped substrate and an adhesion target member via the adhesive layer, wherein
the substrate is a separator substrate or an electrode substrate,
the composition for the non-aqueous secondary battery adhesive layer comprises organic particles, a thixotropic agent, and water, wherein
the organic particles have a core-shell structure including a core portion and a shell portion at least partially covering an outer surface of the core portion,
the composition for the non-aqueous secondary battery adhesive layer has a viscosity η0 at a shear rate of 100 s−1 of less than 10 m·Pas, a viscosity η1 at a shear rate of 10,000 s−1 of not less than 0.5 m·Pas and not more than 2.4 m·Pas, and a ratio η0/η1 of the viscosity η0 relative to the viscosity η1 of not less than 1.2 and not more than 10,
the core portion is formed of a polymer having a degree of swelling in electrolyte solution of not less than a factor of 5 and not more than a factor of 30,
the polymer forming the core portion has a glass-transition temperature of not lower than −50° C. and not higher than 150° C., and
a core-shell ratio of the organic particles, which is an average thickness of the shell portion relative to a volume-average particle diameter (D50) of the organic particles, is 1.5% or more and 40% or less, and
the viscosity η0 and the viscosity η1 are each at a temperature of 25° C.
 
7. A method of producing a non-aqueous secondary battery in which a laminate for a non-aqueous secondary battery obtained by the method of producing a laminate for a non-aqueous secondary battery according to claim 6 is used.